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