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