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