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