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