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