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