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