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