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)(21,22,25,23)(24,26,28,27)(5,7,10,12)(6,11,8,9)(13,15)(14,16)(17,20)(18,19)(21,23,25,22)(24,26,28,27)(6,8)(9,11)(13,16,18,17)(14,19,20,15)(21,24,25,28)(22,26,23,27)(1,2)(3,4)(5,8,10,6)(7,9,12,11)(13,17,18,16)(14,15,20,19)(5,9)(6,12)(7,8)(10,11)(13,15)(14,17)(16,20)(18,19) 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.