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