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