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