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)(17,18)(19,25)(20,22)(21,24)(23,26)(27,31)(28,29)(30,32)(2,7)(3,8)(10,11)(14,15)(18,20)(21,29)(23,25)(27,32) involution — undirected(1,3,6,8)(2,4,7,5)(9,11,13,10)(12,15,16,14)(19,26)(23,25)(27,32)(30,31)(1,4,6,5)(2,3,7,8)(9,12,13,16)(10,14,11,15)(17,19,22,26)(18,23,20,25)(21,27,29,32)(24,30,28,31)(1,2)(3,4)(5,8)(6,7)(17,20,22,18)(19,25,26,23)(21,28,29,24)(27,31,32,30)(1,5,6,4)(2,8,7,3)(17,21)(18,24)(19,27)(20,28)(22,29)(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.