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