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