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