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