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