One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,8)(6,9)(7,10)(11,13)(12,14)(15,16)(17,18)(19,27)(20,29)(21,26)(22,30)(23,25)(24,28)(31,32)(33,34)(35,38)(36,43)(37,40)(39,44)(41,45)(42,48)(46,47) involution — undirected(1,3,7,4)(2,8,10,5)(6,11,15,12)(9,14,16,13)(17,19,23,28)(18,24,25,27)(20,21,30,31)(22,26,29,32)(35,41)(38,45)(42,47)(46,48)(18,25)(19,28)(20,30)(26,32)(33,34,37,40)(35,38,41,45)(36,39,44,43)(42,46,47,48)(1,4,7,3)(2,8,10,5)(6,12,15,11)(9,14,16,13)(17,20)(18,22)(19,21)(23,30)(24,26)(25,29)(27,32)(28,31)(33,34)(35,38)(36,39)(37,40)(41,45)(42,46)(43,44)(47,48)(1,5,7,8)(2,3,10,4)(6,14,15,13)(9,12,16,11)(17,21)(18,26)(19,20)(22,24)(23,31)(25,32)(27,29)(28,30)(33,35,37,41)(34,38,40,45)(36,42,44,47)(39,46,43,48)(1,6,7,15)(2,9,10,16)(3,11,4,12)(5,13,8,14)(17,22)(18,20)(19,26)(21,24)(23,29)(25,30)(27,31)(28,32)(33,36,37,44)(34,39,40,43)(35,42,41,47)(38,46,45,48)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.