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