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