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