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