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