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