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