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