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