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