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