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