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