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