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