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