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