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