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