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