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