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