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