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)(11,14)(12,16)(13,15) involution — undirected(2,5)(3,7)(9,11,13,12)(10,14,15,16)(17,18)(19,28)(20,25)(21,34)(22,38)(23,27)(24,29)(26,36)(30,42)(31,39)(32,41)(33,43)(35,40)(37,48)(44,45)(46,47)(9,12,13,11)(10,14,15,16)(17,19,22,29,23,31,20,32)(18,24,25,28,27,41,38,39)(21,35,36,46,37,30,33,45)(26,42,34,47,43,40,48,44)(2,5)(6,8)(17,20,23,22)(18,25,27,38)(19,29,31,32)(21,33,37,36)(24,39,41,28)(26,34,43,48)(30,45,35,46)(40,47,42,44)(1,3,4,7)(2,6,5,8)(17,21,22,36,23,37,20,33)(18,26,25,34,27,43,38,48)(19,30,29,45,31,35,32,46)(24,40,28,44,41,42,39,47)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.