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