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