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