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