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