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