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