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