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