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