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