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