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