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