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