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