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