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