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