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