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