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