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