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