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