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