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