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