One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,13)(8,18)(9,14)(10,19)(11,15)(12,16)(17,20)(23,31)(24,25)(27,35)(28,29)(32,36)(33,34) involution — undirected(5,7,11,17)(6,12,15,18)(8,9,16,10)(13,14,20,19)(21,22)(23,32)(24,28)(25,29)(26,30)(27,33)(31,36)(34,35)(2,4)(5,8,10,7,11,16,9,17)(6,13,14,18,15,20,19,12)(21,23)(22,27)(24,33)(25,31)(26,34)(28,35)(29,32)(30,36)(5,9,11,10)(6,14,15,19)(7,16,17,8)(12,20,18,13)(21,24,26,25)(22,28,30,29)(23,33,34,31)(27,35,36,32)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.