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