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