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