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)(19,28,29,20)(21,25,31,26)(23,24,32,30)(1,3,4,8)(2,5,6,7)(9,10)(11,14)(12,13)(15,16)(17,19,21,30,22,29,31,24)(18,23,26,28,27,32,25,20)(10,13)(14,16)(17,20,31,32,22,28,21,23)(18,24,25,29,27,30,26,19)(9,11)(10,14)(12,15)(13,16)(19,29)(20,28)(23,32)(24,30) involution — undirected(11,15)(14,16)(17,21,22,31)(18,25,27,26)(19,24,29,30)(20,23,28,32)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.