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