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