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