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