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