One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,7,8,5)(17,18,22,27)(19,20,29,31)(21,25,28,26)(23,30,32,24)(1,3,4,8)(2,5,6,7)(9,10)(11,14)(12,13)(15,16)(17,19,28,30,22,29,21,24)(18,23,25,31,27,32,26,20)(10,13)(14,16)(17,20,21,32,22,31,28,23)(18,24,26,29,27,30,25,19)(9,11)(10,14)(12,15)(13,16)(19,29)(20,31)(23,32)(24,30) involution — undirected(11,15)(14,16)(17,21,22,28)(18,25,27,26)(19,30,29,24)(20,32,31,23)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.