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