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