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