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