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