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)(11,15)(12,13)(14,16)(17,18,23,25)(19,24,22,32)(20,21,26,30)(27,31,29,28)(1,3)(2,6)(4,8)(5,7)(10,13)(14,15)(17,19,23,22)(18,24,25,32)(20,29,26,27)(21,28,30,31)(1,2)(3,6)(4,7)(5,8)(9,10)(11,14)(12,13)(15,16)(18,25)(19,22)(21,30)(27,29) involution — undirected(1,4,5,6)(2,7,8,3)(9,11,12,16)(10,14,13,15)(17,20)(18,21)(19,27)(22,29)(23,26)(24,31)(25,30)(28,32)(1,4)(2,3)(5,6)(7,8)(17,21)(18,26)(19,28)(20,25)(22,31)(23,30)(24,27)(29,32) involution — undirected(1,3)(2,4)(5,7)(6,8)(17,22,23,19)(18,24,25,32)(20,29,26,27)(21,31,30,28)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.