One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,11)(10,13)(12,14)(15,16)(17,18)(19,26)(20,21)(22,23)(24,29)(25,30)(27,28)(31,32)(33,34)(35,39)(36,41)(37,45)(38,40)(42,48)(43,44)(46,47) involution — undirected(2,3)(4,11)(8,10)(12,16)(18,23)(20,30)(24,26)(27,31)(33,35,38,41)(34,39,40,36)(37,46,48,43)(42,44,45,47)(5,13)(8,10)(12,16)(14,15)(18,23)(21,25)(24,26)(28,32)(34,40)(35,41)(42,45)(43,46) involution — undirected(1,3,6,2)(4,7,11,9)(5,10,13,8)(12,14,16,15)(17,19,22,29)(18,24,23,26)(20,31,30,27)(21,28,25,32)(33,36,38,39)(34,41,40,35)(37,47,48,44)(42,43,45,46)(1,4,6,11)(2,7,3,9)(5,12,13,16)(8,14,10,15)(17,20)(18,25)(19,27)(21,23)(22,30)(24,28)(26,32)(29,31)(33,37,38,48)(34,42,40,45)(35,43,41,46)(36,44,39,47)(1,5,6,13)(2,8,3,10)(4,12,11,16)(7,14,9,15)(17,21,22,25)(18,20,23,30)(19,28,29,32)(24,31,26,27)(33,34)(35,39)(36,41)(37,42)(38,40)(43,47)(44,46)(45,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.