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