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