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