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