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