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